It seems strange that pkgconfig is listed as a runtime dependency in
https://github.com/libvips/pyvips/blob/master/setup.py#L85

When it is only used in pyvips_build

https://github.com/libvips/pyvips/blob/master/pyvips/pyvips_build.py#L3

Is it really required during standard runtime?

If not, could we remove it from the install_requires section?

I'm sure there is some edge usecase I'm forgetting here..

The reason I am interested in this is that some users seem to like to use pip check to ensure their installs are consistent, so I would like to avoid the install of an unnecessary package.